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MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 3a8b76c8a88ef370afd431332536ca05029fed6fe71f74b3f60ddf02d233cbed. While MalwareBazaar tries to identify whether the sample provided is malicious or not, there is no guarantee that a sample in MalwareBazaar is malicious.

Database Entry


RemcosRAT


Vendor detections: 12


Intelligence 12 IOCs YARA 34 File information Comments
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SHA256 hash: 3a8b76c8a88ef370afd431332536ca05029fed6fe71f74b3f60ddf02d233cbed
SHA3-384 hash: e19635a436399f309341c35b40f739d1f5329c86ba96f63eb2b898e4b02f0938860e47919d98b44e862f5aa91ce36f83
SHA1 hash: 75a3c0795c6bcf5a342564ba832153bdfd65e1ec
MD5 hash: 9ff5301e004756663ed4e7862ee38dec
humanhash: oxygen-orange-cardinal-triple
File name:加薪文件.pdf.JS
Download: download sample
Signature RemcosRAT
Create hunting rule
File size:4'969'475 bytes
First seen:2026-11-09 10:17:21 UTC
Last seen:Never
File type:Java Script (JS) js
MIME type:text/plain
ssdeep 98304:KcpsROyP2D7lI49b4LEkJBo13edACWUkXvP6T5RUW68vMC6gLhJBw0dEYhjZcDTD:FSofu49b4LToRedpRkXviT5mWEUBwcNM
TLSH T186365A48A09477C5D87C3E71AD1DEFDE073E228B9B25E83B332814E92B5DB963194319
Magika javascript
Reporter abuse_ch
Tags:js RAT RemcosRAT

Intelligence

File Origin
# of uploads :
1
# of downloads :
180
Origin country :
SE SE
Vendor Threat Intelligence
No detections
Verdict:
Malicious
Score:
99.1%
Link:
https://cyber-fortress.com/docs/result/index.php?id=6af1cbf1ac89c90fc65ac034
Tags:
infosteal injection shell sage
Verdict:
Unknown
Link:
https://www.hybrid-analysis.com/sample/3a8b76c8a88ef370afd431332536ca05029fed6fe71f74b3f60ddf02d233cbed
Verdict:
Malicious
File Type:
js
Link:
https://opentip.kaspersky.com/3a8b76c8a88ef370afd431332536ca05029fed6fe71f74b3f60ddf02d233cbed/results?tab=lookup
Result
Threat name:
Remcos, DonutLoader
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/2001569
Signature
Attempt to bypass Chrome Application-Bound Encryption
Benign windows process drops PE files
C2 URLs / IPs found in malware configuration
Contains functionality to steal Internet Explorer form passwords
Creates autostart registry keys with suspicious values (likely registry only malware)
Drops PE files to the document folder of the user
Executes Lua script
Found API chain indicative of debugger detection
Found direct / indirect Syscall (likely to bypass EDR)
Found evasive API chain checking for user administrative privileges
Found hidden mapped module (file has been removed from disk)
Found malware configuration
Installs a global keyboard hook
JavaScript source code contains functionality to generate code involving a shell, file or stream
Malicious sample detected (through community Yara rule)
Maps a DLL or memory area into another process
Modifies the context of a thread in another process (thread injection)
Multi AV Scanner detection for submitted file
Sigma detected: Potential Data Stealing Via Chromium Headless Debugging
Sigma detected: Remcos
Sigma detected: Suspicious Parent Double Extension File Execution
Sigma detected: WScript or CScript Dropper
Switches to a custom stack to bypass stack traces
Tries to detect sandboxes / dynamic malware analysis system (Installed program check)
Tries to harvest and steal browser information (history, passwords, etc)
Tries to steal Mail credentials (via file registry)
Unusual module load detection (module proxying)
Uses an obfuscated file name to hide its real file extension (double extension)
Uses dynamic DNS services
Windows Scripting host queries suspicious COM object (likely to drop second stage)
Writes to foreign memory regions
WScript reads language and country specific registry keys (likely country aware script)
Yara detected DonutLoader
Yara detected Remcos RAT
Yara detected UAC Bypass using CMSTP
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 2001569 Sample: #U52a0#U85aa#U6587#U4ef6.pd... Startdate: 09/11/2026 Architecture: WINDOWS Score: 100 52 ja00.duckdns.org 2->52 54 ideas-irisselection-irisfd-lb.prod-b-wus2.ideas-irisselection-irisfd.westus2-prod.cosmic.office.net 2->54 56 cosmic-westus2-ns-7880e79d3daf.trafficmanager.net 2->56 62 Found malware configuration 2->62 64 Malicious sample detected (through community Yara rule) 2->64 66 Multi AV Scanner detection for submitted file 2->66 70 10 other signatures 2->70 9 wscript.exe 1 5 2->9         started        signatures3 68 Uses dynamic DNS services 52->68 process4 file5 38 C:\Users\user\...\STFVTXAQDVRANLBN.exe, PE32+ 9->38 dropped 40 C:\Users\user\Documents40BLNARVDQAXTVFTS, ASCII 9->40 dropped 74 Benign windows process drops PE files 9->74 76 Drops PE files to the document folder of the user 9->76 78 Windows Scripting host queries suspicious COM object (likely to drop second stage) 9->78 80 2 other signatures 9->80 13 STFVTXAQDVRANLBN.exe 6 16 9->13         started        18 cmd.exe 1 9->18         started        signatures6 process7 dnsIp8 58 ja00.duckdns.org 151.244.232.189, 2424, 49709, 49711 SYNLINQsynlinqdeDE Germany 13->58 60 127.0.0.1 unknown unknown 13->60 42 C:\Users\user\...42BLNARVDQAXTVFTS.vbs, ASCII 13->42 dropped 44 C:\Users\user\AppData\...\cookies.sqlite-shm, SQLite 13->44 dropped 46 C:\Users\user\AppData\...\Login Data.tmp, SQLite 13->46 dropped 50 4 other files (3 malicious) 13->50 dropped 82 Attempt to bypass Chrome Application-Bound Encryption 13->82 84 Tries to steal Mail credentials (via file registry) 13->84 86 Creates autostart registry keys with suspicious values (likely registry only malware) 13->86 88 13 other signatures 13->88 20 cmd.exe 1 13->20         started        22 conhost.exe 13->22         started        25 msedge.exe 7 13->25         started        27 chrome.exe 1 13->27         started        48 #U52a0#U85aa#U6587....js:Zone.Identifier, ASCII 18->48 dropped 29 conhost.exe 18->29         started        file9 signatures10 process11 signatures12 31 conhost.exe 20->31         started        34 msedge.exe 25->34         started        36 conhost.exe 27->36         started        72 Installs a global keyboard hook 29->72 process13 signatures14 90 Installs a global keyboard hook 31->90
Verdict:
inconclusive
YARA:
1 match(es)
Link:
https://app.malva.re/file/9ff5301e004756663ed4e7862ee38dec
Detection:
remcos
Create hunting rule
Link:
https://mwdb.cert.pl/sample/3a8b76c8a88ef370afd431332536ca05029fed6fe71f74b3f60ddf02d233cbed/
Threat name:
Win32.Trojan.Generic
Create hunting rule
Status:
Suspicious
First seen:
2026-11-09 05:16:51 UTC
AV detection:
6 of 24 (25.00%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=hkfxnsfir3zxbl6ugezsknwkaubj73lp44pxjm7wbxpqfurtzpwq._file
Verdict:
malicious
Label(s):
DonutLoader
Create hunting rule
Remcos
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Link:
https://reports.threatray.com/db6b6b9b-f872-4c7f-a78b-93e1301d6496
Result
Malware family:
remcos
Create hunting rule
Score:
  10/10
Tags:
family:donutloader family:remcos botnet:remotehost collection credential_access defense_evasion discovery execution loader persistence rat spyware stealer trojan
Link:
https://tria.ge/reports/261109-mb2gdaee88/
Behaviour
outlook_office_path
System policy modification
Suspicious use of WriteProcessMemory
Suspicious use of SetWindowsHookEx
Suspicious use of FindShellTrayWindow
Suspicious behavior: NtCreateUserProcessBlockNonMicrosoftBinary
Suspicious behavior: EnumeratesProcesses
NTFS ADS
Modifies registry class
Enumerates system info in registry
Checks processor information in registry
Command and Scripting Interpreter: JavaScript
Enumerates physical storage devices
Executes a command shell one-liner
Reads the TCP/IP host and domain name from the registry
System Time Discovery
Drops file in Windows directory
Executes a VBScript file via the Windows Script Host.
Suspicious use of SetThreadContext
Checks installed software on the system
Adds Run key to start application
Accesses Microsoft Outlook profiles
Reads user/profile data of web browsers
Loads dropped DLL
Executes dropped EXE
Checks computer location settings
Uses browser remote debugging
UAC bypass
Family: Remcos
Family: DonutLoader
Detects DonutLoader
Malware Config
C2 Extraction:
ja00.duckdns.org:2424
jaja00.duckdns.org:2424
Malware Family:
jsdropper
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Malicious:
True
Tags:
javascript
Link:
https://intel.virussign.com/intelligence/file/3a8b76c8a88ef370afd431332536ca05029fed6fe71f74b3f60ddf02d233cbed
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Suspicious File
Score:
0.65
Link:
https://yomi.yoroi.company/submissions/3a8b76c8a88ef370afd431332536ca05029fed6fe71f74b3f60ddf02d233cbed

YARA Signatures

MalwareBazaar uses YARA rules from several public and non-public repositories, such as YARAhub and Malpedia. Those are being matched against malware samples uploaded to MalwareBazaar as well as against any suspicious process dumps they may create. Please note that only results from TLP:CLEAR rules are being displayed.

Rule name:cobalt_strike_tmp01925d3f
Create hunting rule
Author:The DFIR Report
Description:files - file ~tmp01925d3f.exe
Reference:https://thedfirreport.com
Rule name:CP_Script_Inject_Detector
Create hunting rule
Author:DiegoAnalytics
Description:Detects attempts to inject code into another process across PE, ELF, Mach-O binaries
Rule name:DebuggerCheck__API
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:DetectEncryptedVariants
Create hunting rule
Author:Zinyth
Description:Detects 'encrypted' in ASCII, Unicode, base64, or hex-encoded
Rule name:Disable_Defender
Create hunting rule
Author:iam-py-test
Description:Detect files disabling or modifying Windows Defender, Windows Firewall, or Microsoft Smartscreen
Rule name:exploit_any_poppopret
Create hunting rule
Author:Jeff White [karttoon@gmail.com] @noottrak
Description:Identify POP -> POP -> RET opcodes for quick ROP Gadget creation in target binaries.
Rule name:golang_bin_JCorn_CSC846
Create hunting rule
Author:Justin Cornwell
Description:CSC-846 Golang detection ruleset
Rule name:INDICATOR_SUSPICIOUS_Binary_References_Browsers
Create hunting rule
Author:ditekSHen
Description:Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers.
Rule name:INDICATOR_SUSPICIOUS_EXE_UACBypass_CMSTPCOM
Create hunting rule
Author:ditekSHen
Description:Detects Windows exceutables bypassing UAC using CMSTP COM interfaces. MITRE (T1218.003)
Rule name:MULTI_Malware_AgentTesla_ForgeAuto_ed343f78_Extrait
Create hunting rule
Author:Marjoriefort
Description:Detects AgentTesla (inconnu, etat extrait)
Rule name:pe_detect_tls_callbacks
Create hunting rule
Rule name:pe_no_import_table
Create hunting rule
Description:Detect pe file that no import table
Rule name:REMCOS_RAT_variants
Create hunting rule
Rule name:Remcos_unpacked_PulseIntel
Create hunting rule
Author:PulseIntel
Description:Remcos Payload
Rule name:SUSP_Script_PowerShell_Hidden_Launcher
Create hunting rule
Author:Marjoriefort
Description:Script (JS/VBS) lancant PowerShell en mode furtif - dropper frais MalwareBazaar
Reference:Veille fraicheur 2026-09-14 / cluster misses web
Rule name:Sus_All_Windows_PE_Malware
Create hunting rule
Author:DiegoAnalytics
Description:Detects Windows PE malware of all types, avoids non-executables like .html
Rule name:Sus_CMD_Powershell_Usage
Create hunting rule
Author:XiAnzheng
Description:May Contain(Obfuscated or no) Powershell or CMD Command that can be abused by threat actor(can create FP)
Rule name:ThreadControl__Context
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:TigerRAT_pe_yaraify
Create hunting rule
Author:hunts-yara-code
Description:YARAify-tightened byte rule from 9 sample(s) -- VERIFY hits
Rule name:VECT_Ransomware
Create hunting rule
Author:Mustafa Bakhit
Description:Detects activity associated with VECT ransomware. This includes registry modifications and deletions, execution of system and defense-evasion commands, suspicious API usage, mutex creation, file and memory manipulation, ransomware note generation, anti-debugging and anti-analysis techniques, and embedded cryptographic constants (SHA256) characteristic of this malware family. Designed for threat intelligence and malware detection environments.
Rule name:VIGIA_RemcosRAT_12bf67c7
Create hunting rule
Author:VIG-IA - Cognitive Threat Intelligence System for Smart Territories and Tourism Sector
Description:4ecda9dd-c048-413e-8ff4-2532f2e4d6eb - RemcosRAT family and corroborated behavioral indicators
Reference:https://vigia.bisite.es/
Rule name:VIGIA_RemcosRAT_3ca3d51f
Create hunting rule
Author:VIG-IA - Cognitive Threat Intelligence System for Smart Territories and Tourism Sector
Description:b36f2418-9ab3-419b-8c15-e3b00eacabeb - RemcosRAT indicators and original NSIS-packaged sample
Reference:https://vigia.bisite.es/
Rule name:VIGIA_RemcosRAT_614e3ab4
Create hunting rule
Author:VIG-IA - Cognitive Threat Intelligence System for Smart Territories and Tourism Sector
Description:RemcosRAT configuration and corroborated diagnostic indicators
Reference:https://vigia.bisite.es/
Rule name:VIGIA_RemcosRAT_8ac92158
Create hunting rule
Author:VIG-IA - Cognitive Threat Intelligence System for Smart Territories and Tourism Sector
Description:RemcosRAT indicators with corroborated keylogging, credential-access, and scripted execution behavior
Reference:https://vigia.bisite.es/
Rule name:VIGIA_RemcosRAT_be11e16d
Create hunting rule
Author:VIG-IA - Cognitive Threat Intelligence System for Smart Territories and Tourism Sector
Description:c0de03d4-e1e8-4c08-a5f7-4c330428829f - RemcosRAT activity messages and correlated behaviors
Reference:https://vigia.bisite.es/
Rule name:Windows_Trojan_Remcos_921ef449
Create hunting rule
Author:Elastic Security
Rule name:Windows_Trojan_Remcos_b296e965
Create hunting rule
Author:Elastic Security
Reference:https://www.elastic.co/security-labs/exploring-the-ref2731-intrusion-set
Rule name:Win_Clipboard_Clipper_Thengavar
Create hunting rule
Author:Thengavar
Description:Detects malware manipulating the Windows clipboard for clipping or crypto stealing attacks
Rule name:WIN_Malware_Unknown_ForgeAuto_2ffc3572
Create hunting rule
Author:Marjoriefort
Description:Detects Unknown (pe, etat binaire)
Rule name:WIN_Malware_Unknown_ForgeAuto_74566f98
Create hunting rule
Author:Marjoriefort
Description:Detects Unknown (pe, etat binaire)
Rule name:WIN_Malware_Unknown_ForgeAuto_79234c04
Create hunting rule
Author:Marjoriefort
Description:Detects Unknown (pe, etat binaire)
Rule name:win_remcos_rat_unpacked
Create hunting rule
Author:Matthew @ Embee_Research
Description:Detects strings present in remcos rat Samples.
Rule name:win_remcos_w0
Create hunting rule
Author:Matthew @ Embee_Research
Description:Detects strings present in remcos rat Samples.
Rule name:yarahub_win_remcos_rat_unpacked_aug_2023
Create hunting rule
Author:Matthew @ Embee_Research

File information

The table below shows additional information about this malware sample such as delivery method and external references.

Comments